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Measurement capabilities

Many instruments on the Cheyenne II are provided, maintained, and operated by SOAR. In addition, collaborative investigations with scientists from other research organizations greatly expand the measurement capabilities of the SOAR research aircraft.

The research instrumentation available on the SOAR Cheyenne II is listed in the table of measurement capabilities. Typically, the equipment carried on a research project will be a subset of this list. The installation of instruments provided by other investigators can be accommodated, subject to space, weight and electrical power requirements. Access to collaborative instruments must be individually arranged for each mission.

REAL-TIME PARTICLES

CODE

VARIABLE

INSTRUMENT

RANGE

ACCURACY

RESOLUTION

FREQUENCY

AER1

Isokinetic aerosol inlet

Brechtel double diffuser inlet

100 m/s TAS

--

--

--

AER2*

Aerosol spectrometer

PMS PCASP SPP-200

0.1 to 3 m

--

0.02 m, 30 bins

1 Hz

AER3*

Condensation Particle Concentration

TSI 3010

>7 nm

--

0-105 /cm3

1 Hz

AER4*

Condensation Particle Concentration

TSI 3025A

>3 nm

--

0-105 /cm3

1 Hz

AER5*

Fast Mobility Particle Sizer

TSI 3091

5.6 to 560 nm

--

32 channels

1 size distrib/sec

AER6*

Tandem Differential Mobility Alanyzer

TAMU TDMA

0.015 to 0.6 m

--

61 bins

--

* Collaborative investigations with scientists from other research organizations

 

REAL-TIME GASES

CODE

VARIABLE

INSTRUMENT

RANGE

ACCURACY

RESOLUTION

FREQUENCY

GAS1*

SF6 trace level (ppt)

WSU HP5890 gas chromatograph

0 to 1 volt

--

--

1 Hz

GAS2*

O3 U.V. Photometric Analyzer

TEC 49C

5-500 ppb

--

--

1 Hz

GAS3*

SO2 Pulsed Fluorescence Analyzer

TEC 43C

0.3-200 ppb

--

--

1 Hz

GAS4*

CO Gas Filter Correlation Analyzer

TEC 48C

20 ppb @10s

--

--

--

GAS5*

NO/NO2/NOx Chemiluminescent Analyzer

TEC 42C

NO ~10 ppt

@ 10 s
NO2 ~50 ppt @10 s
NOy ~100 ppt @10 s

--

--

--

* Collaborative investigations with scientists from other research organizations

 

METEOROLOGY

CODE

VARIABLE

INSTRUMENT

RANGE

ACCURACY

RESOLUTION

FREQUENCY

MET1

Air temperature
(reverse flow)

0.038" DIA.
Bead Thermistor

-30C to +50C

0.05C/

0.3C
incl DHC

0.01C

< 1 s TC

MET2

Relative humidity
(reverse flow)

Thermoset Polymer
RH Sensor

0 to 100%

2% RH

0.1% RH

5 s TC
@ 20C

MET3

Barometric pressure

MEMS Pressure Sensor

0 to 110000 Pa

100 Pa

10 Pa

20 Hz

MET4

u wind component
(+ North)

Extended Kalman Filter (EKF)

--

0.50 m/s
@ 75 m/s TAS

0.01 m/s

5 Hz

MET5

v wind component
(+ East)

Extended Kalman Filter (EKF)

--

0.50 m/s
@ 75 m/s TAS

0.01 m/s

5 Hz

MET6

w wind component
(+ Down)

Extended Kalman Filter (EKF)

--

0.50 m/s
@ 75 m/s TAS

0.01 m/s

5 Hz

 

CLOUD PHYSICS

CODE

VARIABLE

INSTRUMENT

RANGE

ACCURACY

RESOLUTION

FREQUENCY

CU1

Cloud droplet spectra

DMT CDP

2 to 50 m

--

1 to 2 m, 30 bins

1 Hz

CU2*

Cloud droplet spectra

PMS FSSP SPP-100

2 to 47 m

--

1 to 2 m, 30 bins

1 Hz

CU3

Cloud particle spectra

DMT CIP

25 to 1550 m

--

25 m, 62 bins

1 Hz

CU4

Cloud particle image

DMT CIP

25 to 1550 m

--

25 m

up to 10,000 images/sec

CU5

Liquid water content

DMT LWC-100

0 to 3 g/m3

0.05 g/m3

0.01 g/m3

1 Hz

   

CDP calculated

> 3 g/m3

--

--

1 Hz

* Collaborative investigations with scientists from other research organizations

 

AIRCRAFT VARIABLES

CODE

VARIABLE

INSTRUMENT

RANGE

ACCURACY

RESOLUTION

FREQUENCY

AC1

Position
(Latitude/Longitude)

WAAS DGPS

--

2 m (2 s)

< 1 m

5 Hz

AC2

Altitude

WAAS DGPS

-300 to 18000 m

5 m (2 s)

< 1 m

5 Hz

AC3

Geometric Altitude

King KRA 405
Radar Altimeter

0 to 2000 ft

3% < 500 ft
5% > 500 ft

0.48 ft (0.15 m)

--

AC4

Roll Attitude ()

MEMS IMU/GPS/EKF

-60 to +60

0.1

0.01

5 Hz

AC5

Pitch Attitude ()

MEMS IMU/GPS/EKF

-60 to +60

0.2

0.01

5 Hz

AC6

Yaw Attitude ()/ Heading

MEMS IMU/GPS/EKF

0 to 360

0.1

0.01

5 Hz

AC7

Angle of attack ()

MEMS Pressure Sensor

-15 to +15

0.03
@ 150 m/s

0.001
@ 150 m/s

20 Hz

AC8

Side-slip ()

MEMS Pressure Sensor

-15 to +15

0.03
@ 150 m/s

0.001
@ 150 m/s

20 Hz

AC9

True Air Speed

MEMS Pressure Sensor

0 to 150 m/s

0.1 m/s

0.01 m/s

20 Hz

 

OTHER

CODE

VARIABLE

INSTRUMENT

RANGE

ACCURACY

RESOLUTION

FREQUENCY

X1

Position & velocity

Garmin 530

--

--

--

--

X2

Terrain awareness

Garmin 530 TAWS

1000 ft

--

30 arc-second

--

X3

Traffic collision avoidance

Garmin 530 TCAS

--

--

--

--

X4

Area precipitation

RCA Weather radar

-15 to +15

--

--

--

X5

Video record

Sony DCR-DVD 201

--

--

--

--

X6

Telemetry position, velocity, & event markers

ESD DTS (GPS)

--

--

--

1 Hz

 

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